Issue #1717: rename tp_compare to tp_reserved.  I'll change the
type of tp_compare in a separate commit, for ease of reversion
should things go wrong.
diff --git a/Modules/bz2module.c b/Modules/bz2module.c
index c7cc767..5f1d01b 100644
--- a/Modules/bz2module.c
+++ b/Modules/bz2module.c
@@ -1339,7 +1339,7 @@
 	0,			/*tp_print*/
 	0,			/*tp_getattr*/
 	0,			/*tp_setattr*/
-	0,			/*tp_compare*/
+	0,			/*tp_reserved*/
 	0,			/*tp_repr*/
 	0,			/*tp_as_number*/
 	0,			/*tp_as_sequence*/
@@ -1622,7 +1622,7 @@
 	0,			/*tp_print*/
 	0,			/*tp_getattr*/
 	0,			/*tp_setattr*/
-	0,			/*tp_compare*/
+	0,			/*tp_reserved*/
 	0,			/*tp_repr*/
 	0,			/*tp_as_number*/
 	0,			/*tp_as_sequence*/
@@ -1851,7 +1851,7 @@
 	0,			/*tp_print*/
 	0,			/*tp_getattr*/
 	0,			/*tp_setattr*/
-	0,			/*tp_compare*/
+	0,			/*tp_reserved*/
 	0,			/*tp_repr*/
 	0,			/*tp_as_number*/
 	0,			/*tp_as_sequence*/